Ensure install procedure only runs once

[peterfabian]

All Submissions:

• Have you followed the WooCommerce Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

This is an experimental implementation of a proper locking mechanism using INSERT INTO ... ON DUPLICATE KEY UPDATE. There is some discussion to be had about the effects of locking the whole wp_options table in the case of MyISAM engine or how the gap locks would work in the case of InnoDB engine.

The motivation was to avoid race conditions by using non-atomic test and set for wc_installing transient. Plus, a transient can be removed at any point prior its expiry, so there are really no guarantees about the existing locking solution.

How to test the changes in this Pull Request:

• Have you followed the Writing high-quality testing instructions guide?

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you created a changelog file for each project being changed, ie pnpm --filter=<project> changelog add?
• Have you included testing instructions?

FOR PR REVIEWER ONLY:

• I have reviewed that everything is sanitized/escaped appropriately for any SQL or XSS injection possibilities. I made sure Linting is not ignored or disabled.

[github-actions]

Test Results Summary

Commit SHA: 15f15a7

Test 🧪	Passed ✅	Failed 🚨	Broken 🚧	Skipped ⏭️	Unknown ❔	Total 📊	Duration ⏱️
API Tests	259	0	0	2	0	261	0m 51s
E2E Tests	187	0	0	10	0	197	12m 22s

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To view the full API test report, click here.
To view the full E2E test report, click here.
To view all test reports, visit the WooCommerce Test Reports Dashboard.

[codecov]

Codecov Report

Merging #37480 (15f15a7) into trunk (9c8249f) will increase coverage by 6.0%.
The diff coverage is 90.6%.

Additional details and impacted files

@@             Coverage Diff             @@
##             trunk   #37480      +/-   ##
===========================================
+ Coverage     45.7%    51.7%    +6.0%     
- Complexity   17197    17257      +60     
===========================================
  Files          429      429              
  Lines        64918    79690   +14772     
===========================================
+ Hits         29696    41199   +11503     
- Misses       35222    38491    +3269     

Impacted Files	Coverage Δ
...ocommerce/includes/abstracts/abstract-wc-order.php	76.0% <ø> (+0.2%)	⬆️
...commerce/includes/admin/class-wc-admin-notices.php	16.3% <ø> (-1.5%)	⬇️
...ugins/woocommerce/includes/class-wc-post-types.php	1.4% <0.0%> (-1.2%)	⬇️
...ins/woocommerce/includes/wc-template-functions.php	12.2% <0.0%> (+0.3%)	⬆️
...s/data-stores/abstract-wc-order-data-store-cpt.php	91.6% <87.5%> (-0.7%)	⬇️
plugins/woocommerce/includes/class-wc-install.php	70.4% <100.0%> (+1.4%)	⬆️
...rs/Version1/class-wc-rest-orders-v1-controller.php	67.2% <100.0%> (+21.0%)	⬆️
...rs/Version2/class-wc-rest-orders-v2-controller.php	94.4% <100.0%> (+4.6%)	⬆️
...ion2/class-wc-rest-system-status-v2-controller.php	91.5% <100.0%> (+5.9%)	⬆️
...ugins/woocommerce/includes/wc-update-functions.php	2.4% <100.0%> (+1.0%)	⬆️

... and 335 files with indirect coverage changes